Copies of official documents and orders filed or deposited according to law in the office of the commission, certified by a commissioner or by the chief clerk of the commission under its official seal to be true copies of the original, shall be evidence in like manner as the originals in all matters before the commission and in the courts of this State. The commission may prescribe reasonable charges to be paid for furnishing authenticated copies of such documents and orders. Copies of documents that are not filed with the commission but are deposited with the Office of Regulatory Staff may be certified by the Executive Director of the Office of Regulatory Staff under its official seal to be true copies of the original and shall be evidence in like manner as the originals in all matters before the commission and in the courts of this State. The Office of Regulatory Staff may prescribe reasonable charges to be paid for furnishing authenticated copies of such documents.